Ask HN: Suggestion for a super-simple customer web portal?

I'm looking for a super-simple and pretty/customizable web portal for my product customers: I need to make files available to them every so often and want to just upload them to a SFTP account and have the web portal provide access to those files.

Before I build something, I thought I'd check if you might be aware of something that might meet this need (nearly) out of the box. Not required, but if its in PHP, that'd be a plus.